There are
1,749 mi
from Great Falls, MT to Lexington, KY
That's the driving distance. It would take 1 day 7 hours to go from Great Falls, Montana to Lexington, Kentucky.
The flight distance (direct flight from Great Falls, MT to Lexington, KY) is 1,497.95 mi.
1,749 mi = 2,815.12 kms